Press for filtering fluids.



P. KRAEJSA PRESS FOR HLTERCG FLUIDS.

APPLICATION FILED Patene @015. 2E?, 19M.

Lit)

entre sTriTns PATENT ernten.

PAUL KRASSA, OF GSTBOW, GERMANY, ASSIGNOR TO THE FIRM: OF CHEMTSCHE FARB-IK GSTROV, F GSTROVV', GERMANY.

PRESS FOR FILTERING FLUIDS.

ro-iasos.

Specification of Letters Patent.

Patented Uct. 29, i912.

Application filed October 14, 1911'. Serial No. 654.696.

To NZZ 107mm it may concer/b.

Be it known thatl l, PAUL Knassi, chemist, doctor ot' philosophy, a citizen of the Austro-Hungarian Empire, residing at Gstrow, Grand Dukedom oi Mecklenburg, Germany, have invented certain new and useful lm- 'provements in Presses for Filtering Fluids, of which the following is a specification.

fn many industries, when it is necessary to filter slimy or colloidal fluids, the known apparatus tor filtering-filter bags, presses, suction. and centrifugal apparatus, cto-do not sutiice to separate quickly sediments, etc., from the surrounding fluids. rhis is p articularly the case with slimy or colloidal fluids because the matter which remains behin d interferes with the action ofl the filtering material and forms an impernieable layer above it which destroys its efiiciency. lltith fine grained sediments this disadvantageis less noticeable, because the deposit on the filter in most cases adds to the filtering etiiect of' the latter. rl`hese disadvantages ot the fluids difficult to trait have so far excluded the use of filter presses, so that only other filters such as filter bags have been available. These however occupy a disproportionate amount of space and time as compared with a satisfactory filter pres", and hamper the whole conduct ot business by the very long time requisite for filtering through a number ot' bags.

Vl`he object ot the present invention is to render filter presses available for use with fluids vfiitlicult to filter, such as slimy and colloidal substances. This object is attained in the following` manner, viz., the constituents of the fluid to be strained oft are held in suspension between the filter surfaces of the Vpress throughout the process. 'This is effected in the following manner: stirring` arm is arranged between the filter surfaces of the press and kept during` the whole duration of the process. in continual agitation. The stirringl arms or paddles are attached to a common shaft, as is the `general practice in all churning (or stirring) api'iaratus. ln orde' to avoid the difficult task of braiding and cleaning the shaft within the frame work of the filter and to facilitate the replacement and removal of the stirring arms, without pulling the whole tilter to pieces, the single filters are so designed that they torni a continuous channel through the filter chambers, out ot which the shaft carrying the paddlesl can be inserted or drawn out in a single movement.

construction according to this invention is shown in the accompanying drawing in which,

Figure l is a plan showing various levels ot the mechanism, and Fig. 2 is a longitudinal section on the line 2vs2 in Fig. 1.

The filter press consists ot the receptacle l which is closed in such a manner that the pressure can be reduced at the outlet pipes 2. Tn the bed plate :I the shaft 4L with paddles 5 rests on a` bearing, the shaft runs through a stuffing box ti tixed in the cover and is provided with the drivine wheel T. rl`he tilter plates 8 and the filter trame t) are disposed alternately one over the other and thc filter plates are covered on both surfaces by sieve plates Vl0 which are wrapped in filter cloths 1l. The filter plates are t'urnished with grooves 12. Between the tiltcr plato S the stirring paddle 5 is placed. which rotates'in tle space inclosed by the trame t), and thus keeps 'the sediment' in continual agitation and suspension. liach filter plate S has openings l and channels il which meet in a common channel l5. The middle of the press is traversed by another channel lo through which the shaft with its stirring paddles which are arranged one above the other can be inserted or witlrdrawn.

The operation ot' the filter press is as follows: The fluid to be filtered is poured into the opening '17, and flows through the space. 1S and channel 16 when the paddles act upon it. It is driven through the filter cloths and sieve plates into the grooves lL, openings 13, channel 1st, collecting channel l5 and is drawn ott at 2.

The plates are held together by anchor bolts it) through fianges 20. The common channel lies in the flangesl.

that f claim is:

.t filter-press comprising a frame, movable filter' elements therein, said filter elements each having a transverse opening, the open- -ings arranged to register with each other,

a shaft extending through said openings,

stirrers mounfed on said shaft and arranged to rotate between the surfaces of said filterelements, said strrers being of vslnzrller dimensions than said openmgs whereby the shaft and stirring devices can be Withdrawn l ,l from the press through said openings. zum

means for rotating sald shaft. 1C

In testimony whereof I ax Iny signature in presence of two Witnesses.

. PAUL KRASSA. Witnesses VOLDEMAR HAUPT,

HENRY HASPER. 

